PhD Thesis, 2010 - University College Cork

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Recommendations for further research analysing methane (CH 4 ) production and emission might be beneficial to both better accounting of the greenhouse gas balance and the understanding of the N 2 O flux. To further explore close occurrences of intensive uptake and emission periods, as well as noted gaps in peak events (Chapter 4), a number of approaches can be used to investigate possible causes: • Co-spectra analysis of the identified peak periods, with the emphasis on the uptake peaks. This would allow for analysis of advective effects that are present in flux time series originating from heterogeneous footprint area as the one studied in this project. • Studying clustering properties of the flux and associated time series with telegraph approximation allows for magnitude-independent analysis of turbulent time series. The different types of signal will have generically different types of probability density function of the interpulse distance of the telegraph approximation signals. • Using wavelet thresholding method to identify groups of periods with high and low contributions towards the annual N 2 O balance. It was shown by Katul and Vidakovic (1996) that the Lorentz thresholding function is particularly suitable for such application. 63
References REFERENCES Ball, B. C., I. P. McTaggart and C. A. Watson (2002). "Influence of organic ley-arable management and afforestation in sandy loam to clay loam soils on fluxes of N2O and CH4 in Scotland." Agriculture, Ecosystems & Environment 90(3): 305-317. Barton, L., R. Kiese, D. Gatter, K. Butterbach-Bahl, R. Buck, C. Hinz and D. V. Murphy (2008). "Nitrous oxide emissions from a cropped soil in a semi-arid climate." Global Change Biology 14(1): 177-192. Bateman, E. J. and E. M. Baggs (2005). "Contributions of nitrification and denitrification to N 2 O emissions from soils at different water-filled pore space." Biology and Fertility of Soils 41(6): 379-388. Bouwman, A. F. (1996). "Direct emission of nitrous oxide from agricultural soils." Nutrient Cycling in Agroecosystems 46(1): 53-70. Calanca, P., N. Vuichard, C. Campbell, N. Viovy, A. Cozic, J. Fuhrer and J.-F. Soussana (2007). "Simulating the fluxes of CO 2 and N 2 O in European grasslands with the Pasture Simulation Model (PaSim)." Agriculture, Ecosystems & Environment 121: 164-174. Clayton, H., I. P. McTaggart, J. Parker, L. Swan and K. A. Smith (1997). "Nitrous oxide emissions from fertilised grassland: A 2-year study of the effects of N fertiliser form and environmental conditions." Biology and Fertility of Soils 25(3): 252-260. Crutzen, P. J. (1970). "The influence of nitrogen oxides on the atmospheric ozone content." Quarterly Journal of the Royal Meteorological Society 96(408): 320- 325. 64
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National University of Ireland, Cor
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4.5. Discussion 26 4.5.1. Peak trig
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DECLARATION I declare that this the
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ABSTRACT Nitrous oxide (N 2 O) is a
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Introduction little information exi
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Literature review 2. LITERATURE REV
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Literature review NH 3 → NH 2 OH
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Literature review 2.2. Managed gras
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Material and methods 3. MATERIAL AN
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PhD Thesis, 2010 - University College Cork

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